Some of r/Piracy seems to be willing to play with more p2p solutions. If you're willing to sacrifice archival properties (like the last ten years woth of stuff...) then even an IRC channel might do. Some people are playing with scuttlebutt/ssb, and frankly I don't see why that wouldn't be a good fit, assuming you handle your feed with a bit of care if you want to stay anonymous.

Edit: of course, not everyone is happy about this. There is definitely a culture mismatch between most of the (current) ssb community and r/piracy.